| 摘要 |
PROBLEM TO BE SOLVED: To provide an electroslag welding method capable of improving the toughness of a weld metal and also of inhibiting variation of toughness when bonding a diaphragm to the inside of a box column composed of four skin plates by electroslag welding.SOLUTION: There is provided an electroslag welding method for bonding a diaphragm 2 to the inside of a box column composed of four skin plates 1. The electroslag welding is conducted by: providing a clearance between the upper face of the skin plate 1 and the lower face of the diaphragm 2; contacting the backing strips 3 on the facing two sides of the diaphragm 2; contacting the lower face of the backing strip 3 on the upper face of the skin plate 1; and contacting on the upper face of the skin plate 1 between the backing strips 3, the lower face of a thin steel sheet which contains 0.10 mass% or less of C, 0.008 mass% or less of N, and has a thickness of 1 to 5 mm. |
